Fan blade structure

ABSTRACT

A fan blade structure includes a hub, a plurality of blades and a plurality of flow-guiding units. The hub includes an end surface, a mounting surface and a surrounding side. The hub has a shaft hole located in a center of the hub. The blades are disposed around the surrounding side of the hub at intervals. Each of the blades includes a windward surface, a front edge, a rear edge, an outer edge and a connecting section. The windward surface is configured to generate airflow. The rear edge is disposed opposite to the front edge. The outer edge is connected to the front edge and the rear edge, and the connecting section is connected to the surrounding side. The flow-guiding units are formed on the outer edges of the blades, respectively. Each of the flow-guiding units is composed of a plurality of three-dimensional protrusions.

BACKGROUND Technical Field

The present disclosure relates to a fan blade structure. More particularly, the present disclosure relates to a fan blade structure applied to various types of fans.

Description of Related Art

In a high temperature environment, if there is no air circulation or airflow disturbance, it will often make people feel more stuffy, even sweaty and uncomfortable. In order to improve such problems, an electric fan and an air conditioner have been developed to reduce environmental discomfort. Due to high cost of the air conditioner, people generally choose the electric fan with lower prices and low power consumption. In general, the electric fans can be divided into box fans, vertical fans, ceiling fans, etc. The electric fan is the most common tool used for cooling because the electric fan can accelerate the convection by creating the airflow while rotating, thereby reducing the temperature.

A conventional fan blade structure 3 includes a hub 31 and a plurality of blades 32, as shown in FIG. 1. The blades 32 are disposed around a surrounding side of the hub 31. Each of the blades 32 is obliquely disposed on the surrounding side of the hub 31. Therefore, the conventional fan blade structure 3 may be cooperated with an actuating unit. When the actuating unit drives the conventional fan blade structure 3 to rotate, the blades 32 can be used for guiding airflow.

However, in the conventional fan blade structure 3, the airflow is only guided by the blades 32, and there are no flow-guiding units that can be cooperated. Accordingly, the conventional fan blade structure 3 cannot effectively increase the flow rate in actual use so as to cause a disadvantage that the flow rate is poor while being used and cannot meet the requirements of actual use.

Therefore, a fan blade structure having the features of solving problems of the conventional fan blade structure is commercially desirable.

SUMMARY

According to one aspect of the present disclosure, a fan blade structure includes a hub, a plurality of blades and a plurality of flow-guiding units. The hub has a shape of a hollow body. The hub includes an end surface, a mounting surface and a surrounding side. The hub has a shaft hole located in a center of the hub. The blades are disposed around the surrounding side of the hub at intervals. Each of the blades includes a windward surface, a front edge, a rear edge, an outer edge and a connecting section. The windward surface is configured to generate airflow. The front edge is first contacted with air when each of the blades is rotated. The rear edge is disposed opposite to the front edge. The outer edge is connected to the front edge and the rear edge, and the connecting section is connected to the surrounding side. The flow-guiding units are formed on the outer edges of the blades, respectively. Each of the flow-guiding units is composed of a plurality of three-dimensional protrusions.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows:

FIG. 1 shows a schematic view of a conventional fan blade structure.

FIG. 2 shows one schematic view of a fan blade structure according to one embodiment of the present disclosure.

FIG. 3 shows another schematic view of the fan blade structure of FIG. 2.

FIG. 4 shows a schematic front view of the fan blade structure of FIG. 2.

FIG. 5 shows a partial enlarged view of the fan blade structure of FIG. 4.

FIG. 6 shows a schematic view of the fan blade structure disposed on a fan according to another embodiment of the present disclosure.

FIG. 7 shows a schematic front view of the fan blade structure disposed on the fan of FIG. 6.

DETAILED DESCRIPTION

The embodiment will be described with the drawings. For clarity, some practical details will be described below. However, it should be noted that the present disclosure should not be limited by the practical details, that is, in some embodiment, the practical details is unnecessary. In addition, for simplifying the drawings, some conventional structures and elements will be simply illustrated, and repeated elements may be represented by the same labels.

FIG. 2 shows one schematic view of a fan blade structure 1 according to one embodiment of the present disclosure. FIG. 3 shows another schematic view of the fan blade structure 1 of FIG. 2. FIG. 4 shows a schematic front view of the fan blade structure 1 of FIG. 2. FIG. 5 shows a partial enlarged view of the fan blade structure 1 of FIG. 4. The fan blade structure 1 includes a hub 11, a plurality of blades 12 and a plurality of flow-guiding units 13.

The hub 11 has a shape of a hollow body. The hub 11 includes an end surface 111, a mounting surface 112 and a surrounding side 113. The hub 11 has a shaft hole 110 located in a center of the hub 11. The shaft hole 110 penetrates through the end surface 111 and the mounting surface 112.

A number of the blades 12 is five, but it is not limited thereto. The blades 12 are disposed around the surrounding side 113 of the hub 11 at intervals. Each of the blades 12 includes a windward surface 121, a front edge 122, a rear edge 123, an outer edge 124 and a connecting section 125. The windward surface 121 is configured to generate airflow. The front edge 122 is first contacted with air when each of the blades is rotated. The rear edge 123 is disposed opposite to the front edge 122. The outer edge 124 is connected to the front edge 122 and the rear edge 123. The connecting section 125 is connected to the surrounding side 113 of the hub 11. The front edge 122, the rear edge 123 and the outer edge 124 are formed in an arc shape or an irregular shape.

The flow-guiding units 13 are formed on the outer edges 124 of the blades 12, respectively. Each of the flow-guiding units 13 is composed of a plurality of three-dimensional protrusions 131.

The fan blade structure 1 is explained in detail as follows:

Each of the three-dimensional protrusions 131 of each of the flow-guiding units 13 has a shape of a tubercle on whale flippers. The three-dimensional protrusions 131 of each of the flow-guiding units 13 have a total length defined as L2. The outer edge 124 of each of the blades 12 has a length defined as L1. The total length L2 and the length L1 satisfy the following equation: L2<L1.

The three-dimensional protrusions 131 of each of the flow-guiding units 13 may be arranged in a regular shape or an irregular shape. In FIGS. 2-4, the three-dimensional protrusions 131 of each of the flow-guiding units 13 are arranged in the regular shape, but it is not limited thereto.

Shapes of the three-dimensional protrusions 131 of each of the flow-guiding units 13 may be the same, partially different or totally different, and sizes of the three-dimensional protrusions 131 of each of the flow-guiding units 13 may be the same, partially different or totally different. In FIGS. 2-4, the shapes of the three-dimensional protrusions 131 of each of the flow-guiding units 13 are the same, and the sizes of the three-dimensional protrusions 131 of each of the flow-guiding units 13 are the same, but it is not limited thereto.

The three-dimensional protrusions 131 of each of the flow-guiding units 13 may be formed in an arc shape or a geometric shape different from the arc shape. In FIGS. 2-4, the three-dimensional protrusions 131 of each of the flow-guiding units 13 are formed in the arc shape, but it is not limited thereto.

The hub 11, the blades 12 and the flow-guiding units 13 are integrally connected to each other.

Each of the blades 12 is obliquely disposed on the surrounding side 113 of the hub 11. Accordingly, the fan blade structure 1 of the present disclosure can be completely formed.

FIG. 6 shows a schematic view of the fan blade structure 1 disposed on a fan 2 according to another embodiment of the present disclosure. FIG. 7 shows a schematic front view of the fan blade structure 1 disposed on the fan 2 of FIG. 6. In the embodiment, the fan 2 is formed in a folded configuration, but it is not limited thereto. The fan blade structure 1 includes a hub 11, a plurality of blades 12 and a plurality of flow-guiding units 13. In FIGS. 6 and 7, the detail of the hub 11, the blades 12 and the flow-guiding units 13 is the same as the embodiments of FIGS. 2-5, and will not be described again herein.

In FIGS. 6 and 7, the shaft hole 110 of the hub 11 may be assembled with a motor shaft 21 of the fan 2. When a user feels hot in the summer, the fan 2 of the present disclosure may be used for dissipating heat. When the user drives a motor to rotate the fan blade structure 1 of the present disclosure, the airflow passes through each of the windward surfaces 121 of the blades 12 so as to allow the airflow to flow through the outer edge 124 of the blades 12. In addition, the blades 12 combined with the flow-guiding units 13 have the shape of the tubercle on whale flippers. The flow-guiding units 13 are formed on the outer edges 124 of the blades 12, respectively. Each of the flow-guiding units 13 is composed of the three-dimensional protrusions 131. Accordingly, the outer edges 124 of the blades 12 and a flow path of the fan 2 cause different types of disturbances via the three-dimensional protrusions 131 of the flow-guiding units 13 so as to prevent leakage of the airflow and effectively maintain the airflow in a pressure zone between the blades 12. The airflow may be concentrated at an outlet of the fan 2, so that a maximum flow rate of the fan 2 can be effectively increased to reduce the input performance of the motor to a load. In other words, the fan 2 with high-performance capability can be achieved under the same input performance.

Table 1 lists actual experimental results of the fan blade structure 1 of the present disclosure and a conventional fan blade structure. An experimental group represents the actual experimental results of the fan blade structure 1 of the present disclosure. The flow-guiding units 13 are formed on the outer edges 124 of the blades 12, respectively, and each of the flow-guiding units 13 is composed of the three-dimensional protrusions 131. A control group represents the actual experimental results of the conventional fan blade structure. The conventional fan blade structure includes the blades 12 without the flow-guiding units 13. In Table 1, it is obvious that when the motor of the experiment group is the same as that of the control group, the fan blade structure 1 of the experimental group can reduce a rotational speed with the same flow rate in a wind tunnel test, thereby saving more power. Therefore, the three-dimensional protrusions 131 of the flow-guiding units 13 respectively formed on the outer edges 124 of the blades 12 can really allow the maximum flow rate of the fan 2 to be effectively increased so as to reduce the input performance of the motor to the load. In other words, the fan 2 with high-performance capability can be achieved under the same input performance, thereby saving more power.

TABLE 1 Rotational Flow Rate Voltage Power Speed Item CFM V W rpm Qmax/W Control 509.24 110 9.01 931 56.5194 group Experimental 509.52 110 8 885 63.69 group

According to the aforementioned embodiments and examples, the fan blade structure 1 of the present disclosure utilizes the three-dimensional protrusions 131 of the flow-guiding units 13 formed on the outer edges 124 of the blades 12, respectively, to allow the blades 12 and the flow path to cause different types of disturbances so as to prevent leakage of the airflow and effectively maintain the airflow in the pressure zone between the blades 12. The airflow may be concentrated at an outlet of the fan 2, so that the maximum flow rate of the fan 2 can be effectively increased to reduce the input performance of the motor to the load. In other words, the fan 2 with high-performance capability can be achieved under the same input performance, thereby saving more power. Hence, the fan blade structure 1 of the present disclosure utilizes each of the blades 12 cooperated with each of the flow-guiding units 13 to concentrate the airflow, thus increasing the maximum flow rate in actual use.

Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims. 

What is claimed is:
 1. A fan blade structure, comprising: a hub having a shape of a hollow body, wherein the hub comprises an end surface, a mounting surface and a surrounding side, and the hub has a shaft hole located in a center of the hub; a plurality of blades disposed around the surrounding side of the hub at intervals, wherein each of the blades comprises a windward surface, a front edge, a rear edge, an outer edge and a connecting section, the windward surface is configured to generate airflow, the front edge is first contacted with air when each of the blades is rotated, the rear edge is disposed opposite to the front edge, the outer edge is connected to the front edge and the rear edge, and the connecting section is connected to the surrounding side of the hub; and a plurality of flow-guiding units formed on the outer edges of the blades, respectively, wherein each of the flow-guiding units is composed of a plurality of three-dimensional protrusions.
 2. The fan blade structure of claim 1, wherein each of the three-dimensional protrusions of each of the flow-guiding units has a shape of a tubercle on whale flippers.
 3. The fan blade structure of claim 2, wherein the three-dimensional protrusions of each of the flow-guiding units have a total length defined as L2, the outer edge of each of the blades has a length defined as L1, and the total length L2 and the length L1 satisfy the following equation: L2<L1.
 4. The fan blade structure of claim 3, wherein the three-dimensional protrusions of each of the flow-guiding units are arranged in a regular shape or an irregular shape.
 5. The fan blade structure of claim 4, wherein shapes of the three-dimensional protrusions of each of the flow-guiding units are the same, partially different or totally different, and sizes of the three-dimensional protrusions of each of the flow-guiding units are the same, partially different or totally different.
 6. The fan blade structure of claim 5, wherein the three-dimensional protrusions of each of the flow-guiding units are formed in an arc shape or a geometric shape different from the arc shape.
 7. The fan blade structure of claim 1, wherein the hub, the blades and the flow-guiding units are integrally connected to each other.
 8. The fan blade structure of claim 1, wherein each of the blades is obliquely disposed on the surrounding side of the hub. 